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clock

noun (SPEED)
 
 
/klɒk/ US  /klɑːk/

Definition

the clock [S] a speedometer (= a device that measures speed): I was only doing 30 mph on the clock.The interior of vehicles a milometer (= a device for recording distance travelled): My car's only got 10,000 miles on the clock.The interior of vehicles
(Definition of clock noun (SPEED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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